Bosch SRS43E02GB/18 Dishwasher?

Hi. Our dishwasher seems to be having problems! When you switch it on you can hear the water entering the machineg but it seems to be pooling at the bottom of the machine and not washing the dishes, in fact the dishes are completely dry. The dishwasher tablet drawer had been opened during the programme, but the tablet was still in tact and in place. It doesn't appear to be a pumping or draining issue as we are able to empty the machine by re-setting the programme. Any ideas?